作者:René Peters、Pius Waldmeier、Agnès Joncour
DOI:10.1021/op050065s
日期:2005.7.1
followed by reduction to the corresponding aniline 13 and subsequent Boc protection. Acylation of the methyl group in 14 via lithiation furnished γ-chloroketone 16, which was subjected to acid promoted indole formation to afford 17. In the final step, NaOH induced hydrolytic cleavage of the Boc protecting group followed by direct intramolecular nucleophilic substitution gave rise to target molecule 2
描述了针对三环吲哚衍生物2的短,可缩放的合成方法,所述三环吲哚衍生物2是5-HT 2C激动剂1的合成的中间体。合成开始于将便宜的4-硝基-3-甲基苯酚(11)进行Williamson醚化,然后还原为相应的苯胺13,然后进行Boc保护。通过锂化将14中的甲基酰化,得到γ-氯酮16,将其进行酸促进的吲哚形成,得到17。在最后的步骤,加入NaOH引起的Boc保护基,随后直接分子内亲核取代的水解裂解产生了目标分子2中的65%以上六个步骤的总产率。